Air inlet auxiliary device for vehicles

Abstract

An air inlet auxiliary device provides additional air to an inlet manifold of a vehicle. The auxiliary device includes a main body, a filter assembly mounted to a first end of the main body, a control seat mounted to a second end of the main body and in fluid communication with the inlet manifold, and first and second cylindrical members mounted in the main body. Air passages are defined in the first and second cylindrical members. When the engine of the vehicle is idling or runs under a speed slower than a pre-determined value, more additional air is supplied to the air manifold, and when the engine is running under a speed faster than the pre-determined value, only a small additional amount of air is supplied to the inlet manifold.

What is claimed is: 
     
       1. An air auxiliary device for vehicles, comprising: a main body including a first hole defined in a first end thereof and a second hole defined in a second end thereof, the main body further including a first receiving compartment extending in a direction transverse to a longitudinal direction of the main body, an upper path and a lower path being defined in the main body for intercommunicating the first receiving compartment with the first hole of the main body, a second receiving compartment being defined in the main body and extending in a direction transverse to the longitudinal direction of the main body, a connecting path being defined in the main body between the first receiving compartment and the second receiving compartment, the main body further including a main air path defined therein and extending along the longitudinal direction thereof, the main air path being in fluid communication with the first receiving compartment and the second receiving compartment, and the main body further including an air outlet passage defined therein for intercommunicating the main air path with the second hole of the main body;   a filter assembly mounted in the first hole of the main body for filtering air and having an air output in fluid communication with the upper path and the lower path;   a first cylindrical member received in the first receiving compartment and having an inner path defined therein for intercommunicating the lower path with the main air path, the first cylindrical member further including an annular groove defined in an outer periphery thereof and in fluid communication with the upper path;   a second cylindrical member received in the second receiving compartment, the second cylindrical member comprising an air passage defined therein for intercommunicating the annular groove of the first cylindrical member with the main air path, a check valve being mounted in the air passage such that air is only flowable from the annular groove of the first cylindrical member to the main air path; and   a control seat mounted to the second end of the main body, the control seat including a longitudinal bore extending therethrough and in fluid communication with the air outlet passage, the control seat further including a transverse hole having a first end in fluid communication with the longitudinal bore and a second end adapted to be in fluid communication with an inlet manifold, a guiding sleeve being mounted in the control seat and including a central passage extending therethrough for intercommunicating the air outlet passage with the transverse hole, the guiding sleeve further including a plurality of recesses defined in an outer periphery for intercommunicating the air outlet passage with the transverse hole, a blocking element being mounted in the control seat between the air outlet passage and the guiding sleeve, and means for biasing the blocking element toward the air outlet passage;   whereby when an engine of an vehicle to which the air inlet auxiliary device is mounted runs under a speed slower than a first pre-determined speed, the check valve in the second cylindrical member is closed so that no air is flowable from the annular groove of the first cylindrical member to the main air path, and the central passage of the guiding sleeve is not blocked by the blocking element such that air from the air outlet of the filter assembly flows to the inlet manifold via the lower path, the inner path of the first cylindrical member, the main air path, the air outlet passage, the central passage and the recesses of the guiding sleeve, and the transverse hole;   when the engine runs at a speed faster than the first pre-determined speed yet slower than a second pre-determined speed, the check valve in the second cylindrical member is open so that air is flowable from the annular groove of the first cylindrical member to the main air path, and the central passage of the guiding sleeve is not blocked by the blocking element such that air from the air outlet of the filter assembly flows to the main air path via the lower path and the inner path of the first cylindrical member and also via the upper path, the annular groove of the first cylindrical member, and the air passage of the second cylindrical member, the air in the main air path then flows to the inlet manifold via the air outlet passage, the central passage and the recesses of the guiding sleeve, and the transverse hole; and   when the engine runs under a speed faster than the second pre-determined speed, the check valve in the second cylindrical member is closed so that no air is flowable from the annular groove of the first cylindrical member to the main air path, and the central passage of the guiding sleeve is blocked by the blocking element such that air from the air outlet of the filter assembly flows to the inlet manifold via the lower path, the inner path of the first cylindrical member, the main air path, the air outlet passage, the recesses of the guiding sleeve, and the transverse hole.   
     
     
       2. The air inlet auxiliary device according to claim 1, further comprising a third receiving compartment defined in the main body and extending in a direction transverse to the longitudinal direction of the main body, the third receiving compartment being in fluid communication with the main air path, and a pressure gauge being attached to the main body and in fluid communication with the third receiving compartment to indicate a pressure of the air in the main air path. 
     
     
       3. The air inlet auxiliary device according to claim 1, wherein the filter assembly includes a container securely mounted to the first end of the main body, a filter mounted in the container, and a guiding member mounted in the first hole and having a stem portion which extends in the filter, and the air outlet is defined in the guiding member. 
     
     
       4. The air inlet auxiliary device according to claim 1, wherein the second cylindrical member includes a plurality of inlet openings defined in a periphery thereof for intercommunicating the annular groove with the air passage, and the check valve includes a spring-biased ball mounted in the air passage. 
     
     
       5. The air inlet auxiliary device according to claim 1, wherein the control seat further includes a screw hole defined in an end thereof which is distal to the main body, and further includes an adjusting bolt having an enlarged end in the control seat and a threaded stem which extends beyond the screw hole of the control seat. 
     
     
       6. The air inlet auxiliary device according to claim 5, wherein the biasing means in the control seat includes a first spring mounted between the enlarged end of the adjusting bolt and the guiding sleeve and a second spring mounted between the enlarged end of the adjusting bolt and the blocking element.